Advice for keeping her interest

I've finally got a woman on POF that is expressing interest. My hobby is fishing and she has said she does want to go but due to her work schedule it will be at least a couple more weeks before her schedule will allow. We have only exchanged a few messages on POF. I have not asked for her real email address nor phone number at this time. She is replying to the couple of questions I have asked in a short amount of time not days. My concern is how do I keep her interest in me and I know not to bombard her with a bunch of message exchanges on POF. Need advice on how to proceed on keeping her interest lever and not coming off as needy....